1921 Junior Select-O- Phone candlestick telephone.

Select-O-Phone Manufactured by the Screw Machine Products Company, Providence, RI
Manufactured from about 1918 to March 1948 when the company was sold to Kellogg Switchboard and Supply.
Manufactured by Kellogg from 1948 until about 1965

The transmitter is nicely nickel plated and marked. Bakelite receiver with a brown cloth cord. Looks to have a new rubber ring base.

Sector base Wel marked and numbered 1-12 extensions. 

Operation: Turn knob to desired extension. When the receiver is picked up it makes the connection and returns the selector to its original position. Then you push the ring button to connect the call.